发明授权
EP1181515B1 CIRCULARLY MAGNETIZED DISK-SHAPED TORQUE TRANSDUCER AND METHOD FOR MEASURING TORQUE USING SAME
有权
圆磁化的圆盘状的液力变矩器与法测量扭矩与转换器
- 专利标题: CIRCULARLY MAGNETIZED DISK-SHAPED TORQUE TRANSDUCER AND METHOD FOR MEASURING TORQUE USING SAME
- 专利标题(中): 圆磁化的圆盘状的液力变矩器与法测量扭矩与转换器
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申请号: EP00921590.6申请日: 2000-04-13
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公开(公告)号: EP1181515B1公开(公告)日: 2007-08-01
- 发明人: JONES, Chris
- 申请人: Magna-Lastic Devices, Inc.
- 申请人地址: 111 West Buchanan Street Carthage, IL 62321-0130 US
- 专利权人: Magna-Lastic Devices, Inc.
- 当前专利权人: Magna-Lastic Devices, Inc.
- 当前专利权人地址: 111 West Buchanan Street Carthage, IL 62321-0130 US
- 代理机构: Degwert, Hartmut
- 优先权: US129613P 19990416
- 国际公布: WO2000063663 20001026
- 主分类号: G01L3/02
- IPC分类号: G01L3/02 ; G01L3/14
摘要:
A magnetoelastic torque sensor (2) for providing an output signal indicative of the torque transmitted between radially separated locations of a diskshaped member (10) includes a magnetoelastically active, ferromagnetic, magnetostrictive region which is magnetically polarized in a single circumferential direction and possesses sufficient magnetic anisotropy to return the magnetization in the region, following the application of torque to the member, to the single circumferential direction when the applied force is reduced to zero. First and second torque transmitting elements are directly attached to or form a part of the member at its central axis of rotation and its periphery in such a manner that torque is proportionally transmitted between the member and the transmitting elements. Magnetic field sensor means are mounted proximate (26, 28) to the member to sense the magnitude of the magnetic field produced by the member in response to the torque which is radially transmitted through the member between the first and second transmitting elements. The member is preferably formed of a polycrystalline material wherein at least 50 % of the distribution of local magnetizations lie within a 90° quadrant symmetrically disposed around the single circular direction and has a coercivity sufficiently high that the field arising from the member does not magnetize proximate regions of the member to give rise to parasitic magnetic fields which are of sufficient strength to destroy the usefulness, for force sensing purposes, of the net magnetic field seen by the magnetic field sensor means.
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